CN102412888A - Simulated down converter in satellite demodulator and implementation method thereof - Google Patents
Simulated down converter in satellite demodulator and implementation method thereof Download PDFInfo
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- CN102412888A CN102412888A CN2012100051396A CN201210005139A CN102412888A CN 102412888 A CN102412888 A CN 102412888A CN 2012100051396 A CN2012100051396 A CN 2012100051396A CN 201210005139 A CN201210005139 A CN 201210005139A CN 102412888 A CN102412888 A CN 102412888A
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Abstract
The invention discloses a simulated down converter in a satellite demodulator and an implementation method thereof. The simulated down converter internally comprises an input interface, a gating module, a signal amplification module, a first frequency mixer, a first amplifier, a filter, a second frequency mixer, a second amplifier, a gain-variable amplification circuit and an output interface which are sequentially connected, wherein the first frequency mixer is connected with a first local oscillator, and the second frequency mixer is connected with a second local oscillator. By utilizing the simulated down converter and the implementation method thereof disclosed by the invention, the demodulator connected with the simulated down converter can be better connected with various satellite receiving front-end equipment for use, the compatibility of the satellite demodulator is enhanced, and the cost is lowered.
Description
Technical field
The present invention relates to technical field of satellite communication, analog down converter and its implementation in particularly a kind of satellite demodulator.
Background technology
VSAT (Very Small Aperture Terminal, very small aperture terminal) is meant that one type has the intelligentized miniature very small aperture antenna, that be dirt cheap or miniature earth station, can be installed in the user place easily.The VSAT satellite communication network generally is by lot of V SAT small station and a main website collaborative work, a common satellite communication network that constitutes.
In satellite communication; The descending microwave signal of the satellite that ground-plane antenna in the satellite ground receiving system receives becomes very faint through long-distance transmissions; Need the satellite low-converter that the satellite downlink frequency signal that receives is amplified and frequency conversion, give the demodulation process that demodulator in the ground receiving system carries out signal then.At present; Most of satellite low-converters all adopt changing to intermediate frequencies such as 70MHz commonly used, 140MHz or 210MHz under the whole working band broadband; And the required intermediate frequency of multichannel satellite demodulator is 10.7MHz, causes demodulator to be connected inconvenience, poor, the cost increase of system compatibility with multiple satellite receiving front-end equipment.
Summary of the invention
The objective of the invention is to overcome existing above-mentioned deficiency in the prior art, the implementation method of the analog down converter in a kind of satellite demodulator is provided.This method makes demodulator to be connected use with multiple satellite receiving front-end equipment preferably, strengthens the compatibility of satellite demodulator.
It is a kind of based on the analog down converter in the multichannel VSAT satellite demodulator that the present invention also provides, and makes the demodulator that is connected with low-converter to be connected use with multiple satellite receiving front-end equipment preferably, and the compatibility of satellite demodulator strengthens.
In order to realize the foregoing invention purpose, the invention provides following technical scheme:
The implementation method of the analog down converter in a kind of satellite demodulator, said method comprises the steps:
(a) the different satellite frequency signals that receive are carried out gating;
(b) the satellite frequency signal with gating in the step (a) amplifies;
(c) signal in the carrier signal that first local oscillator is produced and the step (b) after the amplification carries out mixing and forms first intermediate-freuqncy signal, again first intermediate-freuqncy signal is carried out the processing and amplifying first time;
(d) utilize filter in the step (c) for the first time first intermediate-freuqncy signal after the processing and amplifying carry out Filtering Processing;
(e) carry out signal after the Filtering Processing in carrier signal that second local oscillator is produced and the step (d) and carry out the mixing second time and form second intermediate-freuqncy signal, again second intermediate-freuqncy signal is carried out the processing and amplifying second time;
(f) second intermediate-freuqncy signal after the middle processing and amplifying for the second time of step (e) is carried out variable gain and amplify adjusting;
(g) with the signal output after handling in the step (f), output signal frequency is 10.7MHz.
Wherein, adopt fractional phase locked loop formula frequency synthesis mode that signal is carried out mixing in the said step (c); The mode that adopts the frequency synthesis of Direct Digital Frequency Synthesis & Phase formula to combine in the said step (e) is carried out mixing to signal.
Preferably, said filter is a SAW filter, and that the group delay time deviation of SAW filter and frequency are selected is good, the input and output impedance error is little, loss is little, anti-electromagnetic interference performance is good; Signal to output in the said step (g) also will carry out the detection processing, and detection is returned step (f) after handling.
Analog down converter in a kind of satellite demodulator comprises the input interface, the output interface that are used to receive different satellite frequency signals, control interface and power interface, and said analog down converter inside comprises:
The gating module is used for the different satellite frequency signal that said input interface receives is carried out gating;
The signal amplification module is used for the satellite-signal of said gating module gating is amplified;
First frequency mixer and first local oscillator are used for the carrier signal of signal after the said signal amplification module amplification and the generation of first local oscillator is carried out the mixing first time;
First amplifier is used for the signal after the mixing first time is amplified;
Filter is used for the signal after said first amplifier amplification is carried out Filtering Processing;
Second frequency mixer and second local oscillator are used for the carrier signal of signal after the said filter filtering processing and the generation of second local oscillator is carried out the mixing second time;
Second amplifier is used for the signal after the mixing second time is amplified;
With the variable gain amplification module, be used for that the signal after the amplification of second amplifier is carried out variable gain and regulate, the signal after the variable gain amplification module is handled is through said output interface output;
Wherein, Said input interface, gating module, signal amplification module, first frequency mixer, first amplifier, filter, second frequency mixer, second amplifier, variable-gain amplification circuit are connected with output interface successively; Said first frequency mixer connects first local oscillator, and second frequency mixer connects second local oscillator.
Also comprise detecting circuit in the said analog down converter; Said detecting circuit is connected between said output interface and the said variable gain amplification module; Be used for the signal of output interface output is carried out the detection processing, the signal feedback after the processing is given said variable gain amplification module.
Preferably, said filter adopts SAW filter, and the group delay time deviation of SAW filter is good with the frequency selection, the input and output impedance error is little, loss is little, anti-electromagnetic interference performance is good.
Said analog down converter also connects demodulator, and said demodulator comprises the A/D module, is used for the signal of said analog inverter output interface output is carried out the A/D sample quantization, and signal is become digital signal; The FPGA module; Digital signal after being used for said A/D module samples quantized is carried out mixing, extraction, filtering and is obtained two-way quadrature base band data, again two-way quadrature base band data is carried out symbol synchronization, carrier synchronization, automatic signal tracking and signal type identification and handles; With the DSP module, be used for the signal after the said FPGA resume module is deciphered output.
Compared with prior art, beneficial effect of the present invention:
Analog down converter of the present invention institute covering frequence has comprised intermediate frequencies such as 70MHz commonly used in the satellite communication, 140MHz, 210MHz; Adopt the double conversion scheme; Through frequency conversion once more, completely convert above-mentioned intermediate frequency into multichannel demodulator required 10.7MHz intermediate frequency, make that demodulator can be preferably and the use that is connected of multiple satellite receiving front-end equipment; There is very strong compatibility in the system that makes, reduces cost.Analog down converter of the present invention and multichannel VSAT satellite demodulator are used, and the scale control that is used for the medium and small carrier signal of VSAT class satellite is kept, and weak signal is had very strong locking ability, when signal to noise ratio is low, and still can quick lock in.For the known all kinds of interleaving signals that use in the satellite circuit, can realize the software release of an interleave to offer follow-up decoding, for unknown signaling, have the software extensibility.
Description of drawings:
Fig. 1 is an analog down converter implementation method flow chart of the present invention;
Fig. 2 is an analog down converter structural representation of the present invention;
Fig. 3 is an analog down converter internal circuit annexation sketch map of the present invention.
Embodiment
Below in conjunction with Test Example and embodiment the present invention is made further detailed description.But should this be interpreted as that the scope of the above-mentioned theme of the present invention only limits to following embodiment, allly all belong to scope of the present invention based on the technology that content of the present invention realized.
As shown in Figure 1, the implementation method of the analog down converter in a kind of satellite demodulator of the present invention, said method comprises the steps:
Step 1, the different satellite frequency signals that front end receiver is received carry out gating.
Step 2 is amplified the satellite frequency signal of gating in the step 1.The descending microwave signal of satellite becomes very faint through long-distance transmissions, need amplify the downstream frequency signal.
Signal in the step 3, the carrier signal that first local oscillator is produced and step 2 after the amplification carries out mixing and forms first intermediate-freuqncy signal, again first intermediate-freuqncy signal is carried out the processing and amplifying first time.First intermediate-freuqncy signal is preferably 610MHz, so both can guarantee the performance of 40～300MHz frequency range, because the SAW filter of this frequency range is a standard specification, better buys again, has practiced thrift cost.First local oscillator adopts fractional phase locked loop formula frequency synthesis mode (PLL-phase Locked Loop), and the frequency of oscillation of local oscillator and amplitude precision are high, good stability.
Step 4, utilize SAW filter in the step 3 for the first time first intermediate-freuqncy signal after the processing and amplifying carry out Filtering Processing.The design flexibility of SAW filter is big, analog/digital is compatible, group delay time deviation and frequency are selected good (optional frequency range is at 10MHz-3GHz), the input and output impedance error is little, loss is little, anti-electromagnetic interference performance good (EMI), reliability device volume high, that make are little, in light weight, and can realize the function of multiple complicacy.Adapt to the requirement of Modern Communication System equipment and compactization of mobile communication and aspects such as high frequencyization, digitlization, high-performance, high reliability.
Step 5 is carried out signal after the Filtering Processing and is carried out the mixing second time and form second intermediate-freuqncy signal in carrier signal that second local oscillator is produced and the step 4, again second intermediate-freuqncy signal is carried out processing and amplifying; The frequency synthesis mode that second local oscillator adopts Direct Digital frequency synthesis mode (DDS-Digital Direct Frequency Synthesis) to combine with PLL frequency synthesis mode; Guarantee the frequency resolution of 1Hz, can aim at the locking satellite signal accurately.
Step 6 is carried out variable gain to second intermediate-freuqncy signal after the processing and amplifying in the step 5 and is amplified, and makes the output of second intermediate-freuqncy signal keep constant, reduces the interference of extraneous signal.
Step 7, with the signal output after handling in the step 6, output signal frequency is 10.7MHz.
The inventive method also will be carried out the detection processing to the signal of exporting in the said step 7, behind the extraction modulation signal, returns step 6.The inventive method adopts the double conversion technical scheme, and its process is exactly earlier satellite-signal to be converted to first intermediate frequency, through in again this first intermediate frequency is transformed to second intermediate frequency through the frequency conversion second time after putting, through in put after again demodulation obtain primary signal.The first intermediate-freuqncy signal frequency is 610MHz among the present invention, increases the frequency conversion sum of series and uses the first higher IF-FRE all to help improving the image frequency inhibition.
Like Fig. 2, shown in Figure 3; The present invention also provides the analog down converter in a kind of satellite demodulator; Comprise the input interface (RF IN), the output interface (IF OUT) that are used to receive different satellite frequency signals; Control interface (COM) and power interface (DCIN), control interface (COM) the two kinds of mode of operations of having communicated by letter with this machine, the one, the unit mode of operation: under this mode with the PC serial ports directly to in-local; A kind of in addition pattern is the multisequencing pattern: this mode is operated and is controlled many playscripts with stage directions machine with a machine.Said analog down converter inside comprises: the gating module is used for the different satellite frequency signal that said input interface receives is carried out gating; The signal amplification module is used for the satellite-signal of said gating module gating is amplified; First frequency mixer and first local oscillator are used for the carrier signal of signal after the said signal amplification module amplification and the generation of first local oscillator is carried out the mixing first time; First amplifier is used for the signal after the mixing first time is amplified; Filter; Be used for the signal after said first amplifier amplification is carried out Filtering Processing; Preferably; Said filter adopts SAW filter; The design flexibility of SAW filter is big, analog/digital is compatible, group delay time deviation and frequency are selected good (optional frequency range is at 10MHz-3GHz), the input and output impedance error is little, loss is little, anti-electromagnetic interference performance good (EMI), reliability device volume high, that make are little, in light weight, and can realize the function of multiple complicacy, adapts to the requirement of Modern Communication System equipment and compactization of mobile communication and aspects such as high frequencyization, digitlization, high-performance, high reliability; Second frequency mixer and second local oscillator are used for the carrier signal of signal after the said filter filtering processing and the generation of second local oscillator is carried out the mixing second time; Second amplifier is used for the signal after the mixing second time is amplified; With the variable gain amplification module, be used for that the signal after the amplification of second amplifier is carried out variable gain and regulate, inhibit signal is constant, reduces the interference of extraneous signal, and the signal after the variable gain amplification module is handled is exported through said output interface.
Further; Also comprise detecting circuit in the said analog down converter; Said detecting circuit is connected between said output interface and the said variable gain amplification module, is used for the signal of output interface output is carried out the detection processing, and the signal feedback after the processing is given said variable gain amplification module.
Said analog down converter also connects demodulator, and said demodulator comprises the A/D module, is used for the signal of said analog inverter output interface output is carried out the A/D sample quantization, and signal is become digital signal; The FPGA module; Digital signal after being used for said A/D module samples quantized is carried out mixing, extraction, filtering and is obtained two-way quadrature base band data, again two-way quadrature base band data is carried out symbol synchronization, carrier synchronization, automatic signal tracking and signal type identification and handles; With the DSP module, be used for the signal after the said FPGA resume module is deciphered output.Analog down converter of the present invention and multichannel VSAT satellite demodulator are used, and the scale control that is used for the medium and small carrier signal of VSAT class satellite is kept, and weak signal is had very strong locking ability, when signal to noise ratio is low, and still can quick lock in.For the known all kinds of interleaving signals that use in the satellite circuit, can realize the software release of an interleave to offer follow-up decoding, for unknown signaling, have the software extensibility.
Analog down converter of the present invention institute covering frequence has comprised intermediate frequencies such as 70MHz commonly used in the satellite communication, 140MHz, 210MHz; Adopt the double conversion scheme; Through frequency conversion once more; Completely convert above-mentioned intermediate frequency into multichannel demodulator required 10.7MHz intermediate frequency, make that demodulator can be preferably and the use that is connected of multiple satellite receiving front-end equipment, there is very strong compatibility in the system that makes.
Combine accompanying drawing that embodiments of the invention are described in detail above; But the present invention is not limited to the foregoing description; In the ken that those of ordinary skills possessed, can also make various variations, these variations all belong within protection scope of the present invention.
Claims (9)
1. the implementation method of the analog down converter in the satellite demodulator, it is characterized in that: said method comprises the steps:
(a) the different satellite frequency signals that receive are carried out gating;
(b) the satellite frequency signal with gating in the step (a) amplifies;
(c) signal in the carrier signal that first local oscillator is produced and the step (b) after the amplification carries out mixing and forms first intermediate-freuqncy signal, again first intermediate-freuqncy signal is carried out the processing and amplifying first time;
(d) utilize filter in the step (c) for the first time first intermediate-freuqncy signal after the processing and amplifying carry out Filtering Processing;
(e) carry out signal after the Filtering Processing in carrier signal that second local oscillator is produced and the step (d) and carry out the mixing second time and form second intermediate-freuqncy signal, again second intermediate-freuqncy signal is carried out the processing and amplifying second time;
(f) second intermediate-freuqncy signal after the middle processing and amplifying for the second time of step (e) is carried out variable gain and amplify adjusting;
(g) with the signal output after handling in the step (f), output signal frequency is 10.7MHz.
2. the implementation method of the analog down converter in a kind of satellite demodulator according to claim 1 is characterized in that: adopt fractional phase locked loop formula frequency synthesis mode that signal is carried out mixing in the said step (c).
3. the implementation method of the analog down converter in a kind of satellite demodulator according to claim 1 is characterized in that: the mode that adopts the frequency synthesis of Direct Digital Frequency Synthesis & Phase formula to combine in the said step (e) is carried out mixing to signal.
4. the implementation method of the analog down converter in a kind of satellite demodulator according to claim 1 is characterized in that: said filter is a SAW filter.
5. according to the implementation method of the analog down converter in each described a kind of satellite demodulator of claim 1 to 4, it is characterized in that: the signal to output in the said step (g) carries out the detection processing, and detection is returned step (f) after handling.
6. the analog down converter in the satellite demodulator comprises the input interface, the output interface that are used to receive different satellite frequency signals, and control interface and power interface is characterized in that: said analog down converter inside comprises:
The gating module is used for the different satellite frequency signal that said input interface receives is carried out gating;
The signal amplification module is used for the satellite-signal of said gating module gating is amplified;
First frequency mixer and first local oscillator are used for the carrier signal of signal after the said signal amplification module amplification and the generation of first local oscillator is carried out the mixing first time;
First amplifier is used for the signal after the mixing first time is amplified;
Filter is used for the signal after said first amplifier amplification is carried out Filtering Processing;
Second frequency mixer and second local oscillator are used for the carrier signal of signal after the said filter filtering processing and the generation of second local oscillator is carried out the mixing second time;
Second amplifier is used for the signal after the mixing second time is amplified;
With the variable gain amplification module, be used for that the signal after the amplification of second amplifier is carried out variable gain and regulate, the signal after the variable gain amplification module is handled is through said output interface output;
Wherein, Said input interface, gating module, signal amplification module, first frequency mixer, first amplifier, filter, second frequency mixer, second amplifier, variable-gain amplification circuit are connected with output interface successively; Said first frequency mixer connects first local oscillator, and second frequency mixer connects second local oscillator.
7. the analog down converter in a kind of satellite demodulator according to claim 6; It is characterized in that: also comprise detecting circuit in the said analog down converter; Said detecting circuit is connected between said output interface and the said variable gain amplification module; Be used for the signal of output interface output is carried out the detection processing, the signal feedback after the processing is given said variable gain amplification module.
8. the analog down converter in a kind of satellite demodulator according to claim 6 is characterized in that: said filter is a SAW filter.
9. the analog down converter in a kind of satellite demodulator according to claim 6; It is characterized in that: said analog down converter connects demodulator; Said demodulator comprises the A/D module; Be used for the signal of said analog inverter output interface output is carried out the A/D sample quantization, signal is become digital signal;
The FPGA module; Digital signal after being used for said A/D module samples quantized is carried out mixing, extraction, filtering and is obtained two-way quadrature base band data, again two-way quadrature base band data is carried out symbol synchronization, carrier synchronization, automatic signal tracking and signal type identification and handles;
With the DSP module, be used for the signal after the said FPGA resume module is deciphered output.
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| CN103023553A (en) * | 2012-11-23 | 2013-04-03 | 成都林海电子有限责任公司 | Method for controlling VSAT satellite communication L-band down converter |
| CN103391047A (en) * | 2013-07-12 | 2013-11-13 | 成都林海电子有限责任公司 | 1.2GHz-bandwidth L-waveband down converter and down converter achieving method |
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Cited By (3)
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| CN103023553A (en) * | 2012-11-23 | 2013-04-03 | 成都林海电子有限责任公司 | Method for controlling VSAT satellite communication L-band down converter |
| CN103023553B (en) * | 2012-11-23 | 2015-07-08 | 成都林海电子有限责任公司 | Method for controlling VSAT satellite communication L-band down converter |
| CN103391047A (en) * | 2013-07-12 | 2013-11-13 | 成都林海电子有限责任公司 | 1.2GHz-bandwidth L-waveband down converter and down converter achieving method |
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Application publication date: 20120411 |